#!/usr/bin/env python3
"""B9A read-only helper: dump words / strings / bytes from stock lk.bin (base 0x8f600000).
usage: lkmem.py lk.bin w ADDR N | s ADDR | b ADDR N"""
import sys, struct
BASE=0x8f600000
d=open(sys.argv[1],'rb').read()
def w(a): return struct.unpack_from('<I',d,a-BASE)[0]
def s(a):
    o=a-BASE
    if not (0<=o<len(d)): return None
    e=d.find(b'\0',o); t=d[o:e]
    return t.decode('latin1') if t and all(32<=c<127 or c in (9,10) for c in t) else None
k=sys.argv[2]; a=int(sys.argv[3],16)
if k=='w':
    for i in range(int(sys.argv[4])):
        v=w(a+4*i); st=s(v) if BASE<=v<BASE+len(d) else None
        print(f'{a+4*i:08x}: {v:08x} {v:10d}' + (f'  -> {st!r}' if st else ''))
elif k=='s': print(repr(s(a)))
elif k=='b': print(d[a-BASE:a-BASE+int(sys.argv[4])].hex(' '))